ANNULAR MODE
; CLIMATE-CHANGE
; SEA-ICE
; CMIP5
; PRECIPITATION
; CIRCULATION
; PROJECTION
; REGION
; COAST
; SAM
WOS学科分类:
Meteorology & Atmospheric Sciences
WOS研究方向:
Meteorology & Atmospheric Sciences
英文摘要:
The southwest region of South Africa is the only part of southern Africa that predominantly receives its total annual rainfall during the austral winter months (April-September). In 2015-2017, this part of the country experienced extreme dry conditions which led to the severe water shortages experienced in the city of Cape Town. In this study, focused is placed on understanding the contribution of the early winter period (April-May) to wet and dry years in the southwestern part of South Africa. This period is of particular interest given its key role in the recent drought, the lack of previous work on this season, and climate change projections that the winter rainy season may shorten in duration. The early winter is found to be prone to dry conditions in recent decades, such that five of the six driest April-May in recent record have occurred after the year 2000. The dry early winters in particular tend to be associated with a weaker subtropical jet, less moisture flowing into the domain and a more stable atmosphere. It is found that although there is a moderate relationship between the Southern Annular Mode and early winter rainfall, it is not as strong as that compared to the full winter period. An analysis of CMIP5 models find that the projections portray the winter rainfall region in South Africa as being exposed to an increased likelihood of early winter dry conditions into the future (2040-2060). However, it remains a challenge for these models to reasonably capture the onset of winter rainfall in South Africa.
Univ Cape Town, Dept Oceanog, Private Bag X3, ZA-7701 Rondebosch, South Africa
Recommended Citation:
Mahlalela, P. T.,Blamey, R. C.,Reason, C. J. C.. Mechanisms behind early winter rainfall variability in the southwestern Cape, South Africa[J]. CLIMATE DYNAMICS,2019-01-01,53(1-2):21-39